The node field is always page_to_nid(c->page). So its rather easy to
replace. Note that there will be additional overhead in various hot paths
due to the need to mask a set of bits in page->flags and shift the
result.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
include/linux/slub_def.h | 1 -
mm/slub.c | 15 ++++++---------
2 files changed, 6 insertions(+), 10 deletions(-)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2011-11-08 09:53:04.043865616 -0600
+++ linux-2.6/mm/slub.c 2011-11-09 11:10:46.111334466 -0600
@@ -1551,7 +1551,6 @@ static void *get_partial_node(struct kme
if (!object) {
c->page = page;
- c->node = page_to_nid(page);
stat(s, ALLOC_FROM_PARTIAL);
object = t;
available = page->objects - page->inuse;
@@ -2016,7 +2015,7 @@ static void flush_all(struct kmem_cache
static inline int node_match(struct kmem_cache_cpu *c, int node)
{
#ifdef CONFIG_NUMA
- if (node != NUMA_NO_NODE && c->node != node)
+ if (node != NUMA_NO_NODE && page_to_nid(c->page) != node)
return 0;
#endif
return 1;
@@ -2105,7 +2104,6 @@ static inline void *new_slab_objects(str
page->freelist = NULL;
stat(s, ALLOC_SLAB);
- c->node = page_to_nid(page);
c->page = page;
*pc = c;
} else
@@ -2202,7 +2200,6 @@ new_slab:
if (c->partial) {
c->page = c->partial;
c->partial = c->page->next;
- c->node = page_to_nid(c->page);
stat(s, CPU_PARTIAL_ALLOC);
c->freelist = NULL;
goto redo;
@@ -2233,7 +2230,6 @@ new_slab:
c->freelist = get_freepointer(s, object);
deactivate_slab(s, c);
- c->node = NUMA_NO_NODE;
local_irq_restore(flags);
return object;
}
@@ -4437,9 +4433,10 @@ static ssize_t show_slab_objects(struct
struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu);
struct page *page;
- if (!c || c->node < 0)
+ if (!c || !c->page)
continue;
+ node = page_to_nid(c->page);
if (c->page) {
if (flags & SO_TOTAL)
x = c->page->objects;
@@ -4449,16 +4446,16 @@ static ssize_t show_slab_objects(struct
x = 1;
total += x;
- nodes[c->node] += x;
+ nodes[node] += x;
}
page = c->partial;
if (page) {
x = page->pobjects;
total += x;
- nodes[c->node] += x;
+ nodes[node] += x;
}
- per_cpu[c->node]++;
+ per_cpu[node]++;
}
}
Index: linux-2.6/include/linux/slub_def.h
===================================================================
--- linux-2.6.orig/include/linux/slub_def.h 2011-11-08 09:53:03.979865196 -0600
+++ linux-2.6/include/linux/slub_def.h 2011-11-09 11:10:46.121334523 -0600
@@ -45,7 +45,6 @@ struct kmem_cache_cpu {
unsigned long tid; /* Globally unique transaction id */
struct page *page; /* The slab from which we are allocating */
struct page *partial; /* Partially allocated frozen slabs */
- int node; /* The node of the page (or -1 for debug) */
#ifdef CONFIG_SLUB_STATS
unsigned stat[NR_SLUB_STAT_ITEMS];
#endif
--
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